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Power tip: Cut transformer interwinding capacitance effects

Posted: 06 Jun 2011 ?? ?Print Version ?Bookmark and Share

Keywords:interwinding capacitance? transformer? windings?

If you have already built a low-power flyback converter with a high turns ratio, you have most likely faced problems with interwinding capacitance. In this article, we take a look at techniques to reduce the capacitance effects that allow higher frequency operation.

A figure in this article illustrates a circuit that is indicative of the problem. In this transformer, we started with a high turns ratio (40:1) between the secondary and the primary windings.

The transformer has distributed capacitance from the secondary winding-to-ground. The high-voltage switching on the secondary causes current to flow in this capacitance, which is reflected back to the primary. The effective capacitance seen on the primary is the secondary distributed capacitance multiplied by the turns ratio squared.

View the PDF document for more information.

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